Great Britain

Great Britain refers to the largest of the British Isles. The word "Great"
simply means "larger" (no connection with "greatness" in other senses is
intended) in contrast to
Brittany, a
historical term for a
peninsula
in modern France that largely corresponds with the present day French province
of Bretagne.
That region was settled by many British immigrants during the period of
Anglo-Saxon migration into Britain, and named "Little Britain" by them. The
French term "Bretagne" now refers to the French "Little Britain", not to the
British "Great Britain", which in French is called Grande-Bretagne.